The Ariel W/NG 350 was a British military motorcycle based on the well proven Ariel Red Hunter singles built by Ariel Motorcycles, and designed by the firm's chief designer Val Page in 1932 around an engine he developed six years earlier. Although the Ariel was not initially selected by the War Department, they were in great demand after the evacuation of Dunkirk when much of the British Army's materiel had been left behind.